iPhone X screen issues

Hi! I recently purchased an iPhone X thru Fido, and I am experiencing a lot of issues with my screen! It gets very jittery when I touch it, changes screens on its own, and if I try to text, a multitude of letters all come up, and when I try to erase them it keeps repeating them forward! Anyone else having any issues like this? I am actually typing this through speak n text, because I I am not able to text on the screen.